cm:Concept: us-gaap:LineOfCreditFacilityFairValueBasisForMeasurement
| Line of Credit Facility, Fair Value, Basis for Measurement |
| us-gaap:LineOfCreditFacilityFairValueBasisForMeasurement |
| Description of the method(s) used to measure fair value of the amount outstanding under the credit facility and any significant assumptions used in the fair value measurement. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:LineOfCreditFacilityFairValueBasisForMeasurement |